PATTERSON, T. E. (1990). The American Democracy Thomas E. Patterson. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)PATTERSON, Thomas E. The American Democracy Thomas E. Patterson. McGraw-Hill, 1990.
Lua MLA (8ú heag.)PATTERSON, Thomas E. The American Democracy Thomas E. Patterson. McGraw-Hill, 1990.
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